Wilhelm hasenbach



(No Model.)

W. HASENBACH. PROGESS OF SEPARATING THE TIN PROMQSGRAROR PIECES OF TIN PLATE 0R TINNED IRON BY MEANS OF HYDROOHLORIG AGID.

No. 344,575. tented June 29, 1886.

Fay Z I s L j- 1 I jig Z.

WITNESSES INVENTOR Wfl BY ATTORNEYS.

N. PETERS. Mammo ra hy. Washmgkm. 0.1:.

NITED STATES PATENT tries,

WVILHELM HASENBAOH, OF MANNHEIM, GERMANY.

PROCESS OF SEPARATING THE TIN FROM SCRAP OR PIECES OF TIN-PLATE OR TINNED IRON BY MEANS OF HYDROCH LORlC ACID.

QPECIPICA-IION forming part of Letters Patent No. 344:,5'75, dated June 29, 1886,

A pplicaiion liled September ll, 1885. Serial No. 176,762. (No model.)

To aZZ whom it may concern:

Be it known that 1, \VILHELM HAsENBAoH, doctor of philosophy, a citizen of Germany, and a resident of Mannheim, Germany, have invented new and useful Improvements in the Process of Separating the Tin from Scraps or Pieces of Tin-Plate or Tinned Iron by Means of Hydrochloric Acid, of which the following is a specification.

This invention has for its object to separate tin from tinsmiths cuttings and other scraps or pieces of tin-plate, and comprises a process whereby protochloride of tin is formed.

According to the said in vention the scraps or pieces of tin-plate are treated with gaseous hydrochloric acid at an elevated temperature.

Reference is to be had to theaccompanying drawings, forming part of this specification, in

which similar letters of reference indicate corresponding parts in both the figures.

Figure 1 is a cross-sectional elevation of an apparatus used in myimproved process. Fig. 2 is a sectional plan view of the same.

In carrying out the improved process the scraps or pieces of tin'plate are placed in a suitable vessel, A, and heated to about 400 Celsius. The gaseous hydrochloric acid is then caused to pass through the said vessel, entering by the tube B and passing out bythe tube 0, and thus coming into contact with the scraps or pieces of tin-plate. The tin of the tinplate combines with the hydrochloric acid and protochloride of tin and hydrogen are produced according to the formula Sn+2HO1=SnOl,l-SH.

The protochloride of tin thus produced distills off at the temperature to which, as above stated, the tin-plate is heated by the furnaces D D, and after being condensed in the space E can be worked up'or utilized in any wellknown or convenient manner.

The gaseous hydrochloric acid may be produced either by decomposing m uriate of soda with sulphuric acid or by allowing a highlywatery solution of hydrochloric acid and concentrated sulphuric acid to run together into a suitable vessel, when hydrochlorieacid gas will be evolved in either case.

I am aware that tin scraps have been subjected to the action of muriatic orhydrochloric acid to separate the tin from the iron, and I therefore do not claim such invention.

I heat the tin scraps and subject them while hot to the action of hydrochloric acid in the form of a dry gas or vapor, whereby the pro tochloride of tin will be distilled off from the scraps, thereby avoidingthe necessity of washing the scraps to remove the protochloride of tin, as is the case when treated with hydroehloric acid without the aid of heat.

I claim- The herein-described process of separating tin from .tinsmiths cuttings and other scraps or piecesof tin-plate, consisting in heating the said cuttings, scraps, or other pieces of tinplate and then subjecting the same in a heated state to hydrochloric acid in the form of gas or "apor, as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

VVILHELM HASENBAGH. 

